Baader Filters 2 ' IR - passport filter (685 Nm) (flat-optically polished) (10898)

The hot tip for the 2003 Mars opposition! These filters enable imaging of Mars with webcams from anywhere in the world.

The trick: Instead of capturing the 'LUMINANCE' channel in the standard spectral range of 400-700nm, this filter focuses deep into the red spectrum at 670nm. The transmission window begins at 670nm, just within the visible range, allowing for precise focusing.

The effect: At longer wavelengths, atmospheric turbulence ('seeing') has a significantly reduced impact on image sharpness. This results in much sharper images of dark structures on Mars, Jupiter, the Moon, and even the Sun. These details can be incorporated as a fourth color channel in RGB imaging. This filter is an excellent tool for any CCD camera owner looking to improve imaging under poor seeing conditions.

Specifications:

• Connection (to the telescope): 2"

• Frame size: 2"